#include "apue.h"
#include <sys/wait.h>

char* env_init[] = {"USER=unknown", "PATH=/tmp", NULL};

int main(void)
{
    pid_t pid;

    if ((pid = fork()) < 0)
    {
        err_sys("fork error");
    }
    else if (pid == 0)
    { /* specify pathname, specify environment */
        if (execle("/home/caolei/WorkSpaceUbuntu/SourceCodeByAPUE3e/lesson-08/echoall", "echoall", "myarg1", "MY ARG2",
                   (char*)0, env_init) < 0)
            err_sys("execle error");
    }

    if (waitpid(pid, NULL, 0) < 0)
        err_sys("wait error");

    if ((pid = fork()) < 0)
    {
        err_sys("fork error");
    }
    else if (pid == 0)
    { /* specify filename, inherit environment */
        if (execlp("echoall", "echoall", "only 1 arg", (char*)0) < 0)
            err_sys("execlp error");
    }

    exit(0);
}
